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One of the most common questions asked about recovering data from databases is what to do first. For example, assume that some type of failure occurs on a busy server causing the database process to delete or corrupt information that resides within a database. In this case, you might know approximately when the problem occurred, and thus want to roll back to a time just before it happened. That s where transaction log backups are useful. Assuming that the current transaction log file is available, you ll want to perform the following sequence of steps: 1. Back up the current transaction log. This will ensure that you have a recent backup of transaction information. 2. Restore the database without recovery. 3. Apply any required transaction logs. 4. Apply the transaction log backup created in step 1 with recovery, stopping at the desired point in time.
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The end result of this operation is a database that is consistent to a point in time just before the problem transaction or database corruption occurred. Note that we cannot specify which transactions are committed or rolled back, since this could lead to a logically inconsistent database.
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6 mentioned the importance of keeping a database consistent to a point in time. If a database server goes down unexpectedly due to a hardware, software, or network failure, the system must be made consistent again before it is usable. By generating database backups, you make sure that you have a copy of your information as it existed at a certain time. You can use these backups to restore data, should the need arise. Based on the types of backups you have performed, you will need to adapt your recovery plan. In this section, we ll discuss the actual commands and operations you can use to restore information using SQL Server. If you haven t done so already, I suggest you read the information covered in 6. It is important to understand how database devices are created and the various methods for backing up databases. With this background, you should have enough information to start working with the RESTORE command.
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Before we dive into the actual commands and operations required to restore databases on SQL Server, you should fully understand some of the concepts related to performing the recovery operations. First, when performing restorations, it is often necessary to use the results of more than one backup operation. For example, we ll see how full, differential, and transaction log backups can be combined to restore database information. By default, after a recovery operation is completed, the database is left in a consistent state and is ready to be operational (that is, accept user connections and data modification commands). This is a good way to restore data when you want to perform recovery from a single full backup file. However, if you plan to apply multiple transaction logs, you ll need to tell SQL Server that the operation is not yet complete and that you plan to perform more recovery operations. There are two main ways to perform the commands: Enterprise Manager and Transact-SQL commands. The simplest way to perform most common recovery operations is the graphical Enterprise Manager, because it prompts you for the necessary information. If you need more control over the operations, want to script complex recovery options, or have additional requirements, then the added effort of working with the Transact-SQL commands will be well spent.
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As mentioned, using SQL Enterprise Manager is the easiest and least complicated way to perform restorations. Even so, you should fully understand the effects of various recov-
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